Signal-lamp.



No. 813,885. BATBNTED PEB. 2v, 1908.

A. H. 11881131.8818,- JR.

SIGNAL LAMP.

APPLIGATION FILED PEB.8, 1905.

@gyda UNITED sTATEs PATENT OFFIOE.

SIGNAL-LAIVIF.

Specification of Letters Patent.

Patented Feb. 27, 1906.

Application led February 8, 1905. Serial No. 244,731.

To all whom it may @Macaw/M Be it known that I, ALEXANDER H. HAND- LAN, Jr., a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Signal-Lamps, of which the followin is a full, clear, and exact description, re erence being had tothe accompanying drawings, forming part of this speciiication.

-My invention relates to an improvement in signal-lamps for railway-service and it has for its object to provide a lamp of an efficient construction in which the ventilation is secured entirely at the upper end of thelamp.

Figure I is a vertical section through the central and upper part of my lamp. Fig. II is a horizontal cross-section taken on line II II, Fig. I. Fig. III is a horizontal cross-section taken on line III III, Fig. I.

1 designates the main casing of my lamp, which is provided with a dome-shaped top 2, having a central vertical aperture 3. I

4 designates an inner shell surmounting the top 2 of the lamp-casing and surrounding the aperture 3 therein. This inner shell is provided with a plurality of perforations 5, preferably located near the bottom of the shell. (See Figs. I and III.)

6 is a top plate secured to the upper endA of the inner shell 4, preferably by bending the shell outwardly and flanging the top plate inwardly, as seen at 7, Fig. I.

8 designates vertical vent and draft tubes, having their upper ends seated in the top plate 6. These tubes extend downwardly within the inner shell 4 and through the aperture 3 in the casing-top 2. The tubes 8 are open from end to end, so that the air entering thereinto at their lower ends from the interior of the lamp-casing in which the burner is located may find ready egress at the upper ends of the tubes.

9 is a bell suspended from the lower end of the tubes 8 within the lamp-casing and spaced apart from said casing to permit the circulation of air between said members.

10 designates an outer shell surmounting the casing-top 2 and surrounding the inner shell 4Q concentric therewith, but spaced apart therefrom. In this outer shell is a pluk rality of perforations 11, preferablylocated near the upper end of the shell and through which air iinds ingress from the exterior of -the lamp into the space between the outer and inner shells.

12 is a flaring hood secured to the outer shell 10 at a location above the perforations 11 and extending downwardly to partially inclose the perforations, while at the same time permitting upward passage of air within the hood to gain access to the perforations.

13 is a wind-guard hinged to the outer shell 10 at 14 and provided with a catch 15, that is adapted to engage a keeper 16, by which the guard is held in closed condition. The upper end of the wind-guard 13 is open for the escape of air from the interior thereof, and this open end is protected by a dish-shield 17, that is supported by arms 18, attaching it to the wind-guard.

y The ventilation of my lamp is secured by the circulation of air in the following course: Cold air from the exterior of the lamp passes upwardly beneath the hood 12 and through the perforations 11 in the outer shell 10. It then takes a downward course in the space between the outer and inner shells 10 and 4 and passes through the perforations 5 in the inner shell, thus gaining access to the interior of the last named shell. It then passes downwardly through the aperture 3 in the casing-top 2 and circulates through the space between the casing and the bell 9 to furnish the necessary supply of air within the lamp. The air is constantly heated in the lamp while the flame exists therein, and the heated air naturally rises into the bell 9 and passes therefrom through the vent and draft tubes 8, thereby creating a suction, due to which the inflowing of the cold air from the exterior of the lamp in the course described is main tained. After passing through the vent and draft tubes the air iinds ready egress through the open top of the wind-guard 13.

While I have shown and described a plurality of vent and draft tubes 8 in my lamp, I wish it understood that I do not limit myself to using any particular number of such tubes. It is possible to employ a single tube only, and therefore one or a greater number may be used.

I claim as my invention- In a signal lamp, the combination of a main casing having an apertured top, an inner air-inlet member surmounting said casing at the location of the perforation in the casing and having perforations in its lower end, a top plate secured to the upper end of rounding the inner air-inlet member; said said inlet member,L a plurality of Vent-tubes outer inlet member having perforations in its secured in said top plate and extending downupper end.

Wardlywthin theinlet member, abell secured ALEXANDER H. HANDLAN, JR. to the lower ends of said vent-tubes and In presence of* spaced from the easing, and an outer air-in- NELLIE V. ALEXANDER,

let member surmounting said easing and sur- E. S. KNIGHT. 

